Method for activating and releasing a spindle lock on a power tool and power tool

Abstract

The present invention relates to a method for activating and releasing a spindle lock of a power tool, the spindle lock being operable, for example, by an intuitive action by a user. In particular, activation of the spindle lock can be achieved by a rotational movement by the user relative to the tool mount, the rotational movement being determined by the device electronics of the power tool. An exceeded rotation angle or rotation speed limit value can be used by the device electronics as an activation signal for the spindle lock. The spindle lock can be released if the device electronics determines a rotational movement of the tool mount in the opposite direction. In a further aspect, the present invention relates to a power tool capable of implementing the method for activating and releasing a spindle lock.

Description

[Technical field]

[0001] The invention relates to a method for activating and releasing a spindle lock of a power tool, the spindle lock being operable, for example, by an intuitive action by a user. In particular, the spindle lock can be activated by a rotational movement of the user relative to the tool mount, the rotational movement being recognized by the device electronics of the power tool. Exceeding a limit value of the rotation angle or rotational speed can be used by the device electronics as a signal for activating the spindle lock. The spindle lock can be released if the device electronics detects a rotational movement of the tool mount in the opposite direction. In a further aspect, the invention relates to a power tool capable of implementing the method for activating and releasing a spindle lock. [Background technology]

[0002] The prior art discloses power tools that can perform tasks, for example, on construction sites or in the DIY field. The power tools can be, but are not limited to, cutting or cut-off devices, angle grinders or cut-off grinders, core drill devices, hammer drills, or chisel drills. The power tools usually include a tool, which can be a disk-shaped rotary tool, such as a cut-off or grinder disk, or a hammering or chiseling tool.

[0003] The tools of power implements as known from the prior art are usually driven by an electric motor in the power implement. The motor rotates and the rotation of the motor is converted into a rotation of the tool or into a hammering or chiseling movement of the tool. In the case of core drilling devices, a drill bit is used as a tool to cut a cylindrical drill core from a solid substrate such as concrete, masonry or stone. The drill bit is substantially hollow inside to receive the drill core. Users of core drilling devices know from experience that it can be difficult to extract a drill bit from a borehole that is stuck or jammed in the substrate.

[0004] Power tools, such as for example core drilling devices, usually have a spindle lock, which preferably allows a quick change of the tool of the power tool. The spindle can be blocked so that the tool of the power tool can be particularly easily released. Mechanical and electronic methods for locking the spindle are known in the prior art. In the case of mechanical methods, a mechanical switch or a slide switch is usually provided on the power tool, which can lock the spindle and open the tool lock. In the case of electronic spindle locks, the spindle is often locked by actuating a preferably electronic switching contact. In this case, the actuation of a switch in the device electronics can be converted by a microswitch and / or a microcontroller into a corresponding energization of the motor of the power tool.

[0005] However, providing a dedicated switch for activating and releasing the spindle lock of a power tool has been shown to be complicated to implement. In addition, providing such a switch is undesirable for space reasons, and it cannot be guaranteed that activating such a switch by a user of the power tool is ergonomically practical. Furthermore, the additional switch and operating elements require additional space, which is counter to the need for a compact and convenient power tool. Summary of the Invention [Problem to be solved by the invention]

[0006] The object underlying the present invention is to overcome the above-mentioned drawbacks of the prior art and to specify a method for activating and releasing the spindle lock of a power tool. It would be desirable if a corresponding power tool could dispense with an additional switch for activating or releasing the spindle lock. Moreover, a person skilled in the art would appreciate it if the activation of the spindle lock could be initiated as intuitively as possible, without the user having to activate a complex button combination or perform manual operations. Furthermore, the power tool provided should be as compact and convenient as possible. Another object of the present invention is to show how a drill bit stuck or jammed in a substrate can be released from a borehole more easily than before. [Means for solving the problem]

[0007] This object is achieved by the subject matter of the independent claims. Advantageous embodiments related to the subject matter of the independent claims can be found in the dependent claims.

[0008] In a first aspect, the present invention provides a method of actuating a spindle lock of a power tool. The power tool includes a tool mount for receiving a tool, a motor, and device electronics. The method of actuating the spindle lock comprises the steps of: a) performing a first rotational movement in a first rotational direction on a tool mount of the power tool, the first rotational movement being defined by a rotation angle and / or a rotation speed, and a limit value for the rotation angle and / or the rotation speed being stored in the power tool; b) activating a spindle lock by the device electronics of the power tool when at least one of the rotation angle limit and / or the rotation speed limit is exceeded; Includes.

[0009] In the proposed method, the user of the power tool preferably touches and rotates its tool mount. In other words, the user can perform a rotational movement relative to the tool mount, which can be detected by the device electronics. The tool mount is preferably rotated in a first rotational direction, which can be, for example, a "right" or "left" spatial direction. The corresponding spatial and rotational directions are indicated in the figures by circular arrows.

[0010] The proposed method of activating the spindle lock makes it possible to provide a method in which the corresponding power tool does not need an additional switch for activating the spindle lock. Furthermore, the method is particularly intuitive, since the user performs an intuitive action on the power tool by rotating the tool mount. Within the meaning of the invention, this intuitive rotational movement by the user on the tool mount of the power tool can preferably be recognized by the power tool or its device electronics.

[0011] Within the meaning of the present invention, the power tool or its device electronics preferably comprises at least one rotation sensor, which may for example be arranged in the vicinity of the motor of the power tool. The rotation sensor is preferably configured to detect rotational motion. Within the meaning of the present invention, it is very particularly preferred that the rotation sensor is able to detect the rotational motion of the rotor of the motor of the power tool. The rotation sensor may for example comprise, but is not limited to, a Hall sensor or an AMR sensor (a sensor whose measurement principle is based on the anisotropic magnetoresistance effect). Within the meaning of the present invention, the sensor system used for detecting the rotational motion is preferably configured to generate a digital and / or analog signal representative of the rotation angle of the rotor of the motor of the power tool.

[0012] The rotational movement of the user relative to the tool mount of the power tool can be defined in particular by a rotation angle and / or a rotation speed. The rotation angle preferably represents the angular range of the deflection of the tool mount from its original or rest position. The rotation angle can preferably take positive or negative values, a positive rotation angle representing, for example, a rotational movement of the tool mount in a first spatial direction and a negative rotation angle representing, for example, a rotational movement of the tool mount in a second spatial direction. In the context of the present invention, rotation angles ranging, for example, in magnitude from 1 to 60 degrees are preferred, and can also take all intermediate values, preferably 3.5 degrees, 10 degrees, 17 degrees, 28.3 degrees, etc. Within the meaning of the present invention, the rotation angle preferably specifies a positive or negative deflection of the rotor of the motor of the power tool around the rest position.

[0013] The rotation speed preferably indicates how fast the rotation angle changes over time. Within the meaning of the present invention, a rotational movement of the tool mount that is brought about or caused by a user of the power tool is preferably referred to as a user-initiated movement or a first rotational movement of the tool mount of the power tool.

[0014] Within the meaning of the present invention, limit values ​​of the rotation angle and / or the rotation speed are defined and, if these values ​​are exceeded, the spindle lock is preferably activated automatically. A preferably electronically designed spindle lock function is preferably implemented in the proposed power tool, which can be activated if the limit values ​​of the rotation angle and / or the rotation speed are exceeded. This activation is preferably performed automatically as soon as the device electronics of the power tool detects that at least one of the limit values ​​of the rotation angle and / or the rotation speed is exceeded.

[0015] Within the meaning of the present invention, the magnitude of the limit values ​​of the rotation angle is preferably in the range of 1 to 120 degrees, preferably in the range of 1 to 90 degrees and most preferably in the range of 1 to 60 degrees. In other words, this means that the limit values ​​can be in the range of -120 degrees to +120 degrees, preferably in the range of -90 degrees to +90 degrees and most preferably in the range of -60 degrees to +60 degrees, the deflection being preferably specified in each case around the rest position of the rotor of the motor of the power tool.

[0016] The rotation speed limit may be in the range of 0.05 deg / sec to 60 deg / sec, preferably in the range of 0.2 deg / sec to 45 deg / sec, and most preferably in the range of 0.5 deg / sec to 30 deg / sec.

[0017] Within the meaning of the present invention, the spindle lock is preferably an electronic function that can be implemented, for example, originally in the power tool. Unlike conventional power tools as known from the prior art, in the context of the present invention, it is not necessary to trigger the spindle lock by a button or such a switch provided separately for this purpose. Rather, in the context of the present invention, the function of the power tool or its device electronics is used to detect the rotational movement of the tool mount with respect to the rotation angle and / or the rotation speed, to evaluate this so that the exceeding of corresponding limit values ​​is recognized, and to use this as a trigger or initiation signal for the spindle lock.

[0018] Within the meaning of the present invention, it is preferred that in the context of the present invention only one action by the user of the power tool is required to activate the spindle lock, namely the execution of a rotational movement relative to the tool mount of the power tool. In the present invention, activation of the spindle lock can therefore be made much simpler and more intuitive than in conventional power tools as known from the prior art. Advantageously, handling of the proposed power tool can thus be significantly simplified compared to conventional power tools. Furthermore, in the design of the power tool, an additional switch for activating the preferably electronic spindle lock function can be dispensed with, since such a switch is no longer necessary due to the advantageous interaction of the device electronics with the power tool, as the subject of the present invention. By omitting the additional switch, the present invention makes it possible to provide a particularly compact and convenient power tool which is easier to handle intuitively.

[0019] Within the meaning of the present invention, the rotary movement is preferably detected by the device electronics as a rotation of the motor without active current supply. The device electronics of the power tool are preferably configured to recognize the rotary movement of the tool mount as a rotation of the motor without active current supply and to sense the exceeding of limit values ​​for the rotation angle and / or the rotation speed of the rotary movement as a trigger signal for activating the spindle lock.

[0020] In a second aspect, the present invention relates to a method of unlocking a spindle lock of a power tool, the power tool including a tool mount for receiving a tool, a motor, and device electronics. The method of unlocking the spindle lock comprises the steps of: a) applying a torque to a motor of the power tool in a second rotational direction while the spindle lock is active; b) applying a torque to the motor in the second spatial direction, thereby causing the tool mount to rotate in the second spatial direction; and c) sensing by the device electronics the rotational movement in a second spatial direction; and d) releasing the spindle lock by device electronics of the power tool when rotational movement of the tool mount in the second spatial direction is detected; and Includes.

[0021] The terms, definitions and technical advantages introduced for the method of activating the spindle lock preferably apply equally to the method of releasing the spindle lock.

[0022] Within the meaning of the present invention, for the purpose of locking the spindle, a torque is applied to the motor of the power tool, the direction of rotation or action of which is preferably directed in the opposite direction to the first direction of rotation of the rotational movement of the tool attachment performed by the user of the power tool. Within the meaning of the present invention, the spindle lock is preferably an electronic function of the power tool, the motor of the power tool being powered by the power or device electronics. One advantage of the present invention is that no additional devices are required in the power tool to carry out the proposed method. Within the meaning of the present invention, the speed of the motor of the power tool is preferably adjusted to a value in the range of 0 revolutions / unit time (e.g. revolutions per minute, RPM), thus preventing the motor of the power tool from rotating.

[0023] Within the meaning of the present invention, the rotation or acting direction of the torque is called the second rotation direction. This direction is preferably directed opposite to the rotation direction of the first rotational movement of the tool mount. If the tool mount is rotated by the user of the power tool, for example, in the "right" spatial direction, in order to activate the spindle lock, the torque applied to the motor of the power tool preferably acts in the "left" spatial direction.

[0024] The rotational movement of the tool mount is preferably caused by the application of a torque to the motor. Within the meaning of the present invention, this rotational movement of the tool mount caused by the motor is preferably called a second rotational movement of the tool mount. Within the meaning of the present invention, the release of the tool mount by the user preferably results in the application of a torque which results in a rotational movement of the tool mount in a second spatial direction. In other words, the tool mount can perform a rotational movement that is opposite to the rotational direction of the original rotational movement, in particular when the user of the power tool releases the tool mount, i.e. when he no longer holds the tool mount tightly. Within the meaning of the present invention, it is very particularly preferred that the application of a torque to the motor results in a rotational movement of the tool mount, this rotational movement preferably initiated by the motor being directed in the opposite direction to the original rotational movement initiated by the user. In other words, the application of a torque to the motor results in a rotational movement of the tool mount, this second rotational movement of the tool mount being directed in the opposite direction to the first rotational movement of the tool mount. Within the meaning of the present invention, the second rotational movement of the tool mount may preferably also be referred to as a counter-rotational movement relative to the original first rotational movement of the tool mount. Preferably, a torque is applied to the motor in the second rotational direction, especially when the spindle lock is active.

[0025] Rotational movement of the tool mount in a second spatial direction may be sensed by the device electronics of the power tool. This second rotational movement of the tool mount is preferably sensed using the same sensor that is also used to sense the first rotational movement. Alternatively, it may be preferred that two different sensors or sensor systems are used. The first and second rotational movements preferably differ in their directions of rotation and in the direction of the current passed through the motor of the power tool.

[0026] The spindle lock of the power tool is preferably released as soon as the device electronics detect a rotational movement of the tool mount in the second spatial direction or when the tool mount is again in the region of the rest position. The power tool may comprise a control device for detecting the rotational movement or for measuring and converting the rotational movement into a (release) activation signal for the spindle lock, which in turn may preferably comprise a processor and / or a memory. Within the meaning of the present invention, the power tool preferably comprises a control device that is set to detect rotational movements of the tool mount in different spatial directions and to activate or release the spindle lock depending on the spatial direction.

[0027] Within the meaning of the present invention, it is very particularly preferred that the power tool does not require an additional switch for (releasing) the spindle lock. As explained, the (releasing) activation of the spindle lock according to the invention is performed by detecting the rotational movement of the tool mount, so that no switch specifically intended for (releasing) the spindle lock is required on the power tool.

[0028] The advantage of the invention is, in particular, that a particularly intuitive activation or release of the spindle lock can be provided. In addition, a simple, intuitive and clear operation of the power tool, in particular managed by a relatively small number of switches, is made possible. In this way, in particular the production costs of the power tool can also be kept low and a space-saving and compact power tool can be provided. This can be particularly advantageous in particular when a handheld power tool is provided rather than a column-mounted one. It is very particularly preferred within the meaning of the invention that the power tool is a core drilling device. Naturally, it is also possible to use the proposed method for other types of power tools, such as cut-off or angle grinders, hole punchers or hammer drills, chisels or other devices.

[0029] In a further aspect, the invention relates to a power tool for performing a method for activating a spindle lock, the power tool having a tool mount for receiving a tool, a motor and device electronics. The power tool according to this aspect of the invention is characterized in that the tool mount is designed to be rotatable and the device electronics is configured to detect a rotation angle and / or a rotation speed of a rotational movement of the tool mount. The spindle lock can be activated by the device electronics if at least one limit value of the rotation angle and / or the rotation speed is exceeded. The device electronics can activate a preferably electronic spindle lock function of the power tool if a particularly rapid rotational movement is detected. A particularly rapid rotational movement can be recognized in particular by the rotation speed of the rotational movement exceeding a limit rotational speed. The limit value of the rotation angle and / or the limit value of the rotation speed can be stored in the power tool. For this purpose, the power tool can preferably include a control device, for example comprising a processor and / or a memory. The control device of the power tool may in particular be configured to perform a comparison between a current rotation angle and a limit rotation angle. In particular, the control device may be configured to perform a comparison between a current rotation speed and a limit rotation speed. If this comparison indicates that the current value of the rotation angle and / or the rotation speed exceeds the corresponding limit value, the spindle lock is activated. This activation is preferably performed by the device electronics or by the control device. The control device may in particular be a component of the device electronics.

[0030] In yet another aspect, the invention relates to a power tool for implementing a method for releasing a spindle lock, the power tool having a tool mount for receiving a tool, a motor and device electronics. The power tool according to this aspect of the invention is characterized in that a torque can be applied to the motor of the power tool, the device electronics being configured to detect a rotational movement of the tool mount and to release the spindle lock if a rotational movement in a second spatial direction is detected. In this preferred embodiment of the invention, the tool mount is preferably also designed to be rotatable. Within the meaning of the invention, the torque is preferably applied to the motor by the power tool or its spindle lock function. The direction of rotation or action is preferably directed in the opposite direction to the direction of the original rotational movement of the tool mount caused by the user of the power tool. The application of the torque to the motor results in a rotational movement of the tool mount in particular in the direction of rotation or action of the torque. Within the meaning of the invention, this preferably means that the tool mount is caused to perform a rotational movement of the motor of the power tool in the opposite direction to the initial or first rotational movement of the tool mount caused by the user. This rotational movement can also be sensed by the device electronics of the power tool and used as a signal to release the spindle lock, in other words, the spindle lock is released when the power tool detects a second rotational movement of the tool mount in a direction opposite to the first rotational movement of the tool mount.

[0031] Within the meaning of the present invention, a torque is preferably applied to the motor while the spindle lock is active. Preferably, the application of the torque to the motor results in a second rotational movement of the tool mount. In other words, the application of the torque to the motor results in a rotational movement of the tool mount, the torque being directed in the opposite direction to the first rotational movement of the tool mount.

[0032] Within the meaning of the present invention it is very particularly preferred that the power tool does not require an additional switch for activating and / or releasing the spindle lock.

[0033] Preferably, the present invention can also facilitate the release of a drill bit stuck in a borehole when the power tool is a core drilling device. A rotational movement relative to the power tool is usually required to remove a stuck drill bit from the bottom of the borehole. However, in a non-locking device, there is no rigid connection between the tool and the handle of the power tool. Therefore, the device handle cannot be used to release the drill bit. In an intuitive operation of the proposed spindle lock, a rotation by the user relative to the power tool is recognized by the power tool and a torque can be transmitted to the drill bit by the counter torque of the spindle lock function.

[0034] It has been shown that the use of the device can be significantly expanded or improved by the invention. For example, when the invention is used in an angle grinder, depending on the machine, it may be necessary to activate, i.e. in principle to press, a second tool or a mechanical lock in order to open and / or close the grinder disk mount. In the case of the power tool proposed by the invention, this activation of an additional component of the power tool can be advantageously omitted. The same advantages can be achieved, for example, when the invention is used in a hand-held circular saw.

[0035] Further advantages will become apparent from the following description of the figures. The figures, descriptions, and claims include various feature combinations. Those skilled in the art will also consider features individually and combine them as appropriate to form further useful combinations.

[0036] In the figures, identical and similar components are designated with the same reference numbers. [Brief description of the drawings]

[0037] [Figure 1] 1 shows a diagram of an exemplary preferred embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] FIG. 1 shows a preferred embodiment of the proposed power tool 1. The power tool 1 comprises a motor 4 and device electronics 5, which may be accommodated in a housing of the power tool 1. The positions of the motor 4 and the device electronics 5 of the power tool 1 shown in FIG. 1 should be understood as an example, and of course other positions in the proposed power tool 1 are also conceivable. The power tool 1 also has a tool attachment 2 for fastening a tool 3. The power tool 1 shown in FIG. 1 is a core drilling device, the tool being formed by a drill bit 3. The drill bit 3 is shown diagrammatically in the top left of the upper region of FIG. 1.

[0039] Furthermore, in Fig. 1 the hands of a user 6 of the power tool 1 are shown. The user 6 is able to grip the tool attachment 2 of the power tool 1 and rotate it. Within the meaning of the present invention, the user thus preferably causes a first rotational movement of the tool attachment 2 of the power tool 1. This first rotational movement of the tool attachment 2 can be performed in the spatial direction "right" or "left", which is indicated in Fig. 1 by a curved double arrow. In the coloured representation, this curved double arrow is orange. The rotational direction of the first rotational movement of the tool attachment 2 is preferably also called the first rotational direction within the meaning of the present invention. The power tool 1 is preferably set up to detect the first rotational movement of the tool attachment 2. The rotational movement of the tool attachment 2 can preferably be represented by a rotation angle and / or a rotation speed. Limit values ​​of the rotation angle and / or the rotation speed are stored in the power tool 1, which is preferably set up to detect the current rotation angle and rotation speed and to compare them with the stored limit values. If such a comparison results in one of the stored limits being exceeded, the spindle lock is preferably activated automatically.

[0040] If the spindle lock is enabled, a torque may be applied to the motor 4 of the power tool 1. This application of the torque may be initiated by the device electronics 5 of the power tool 1. The torque is preferably directed in a direction opposite to the rotational direction of the first rotational movement of the tool mount 2. The torque causes a second rotational movement of the tool mount 2, which is directed in a direction opposite to the first rotational movement of the tool mount 2. This second rotational movement of the tool mount 2 may be recognized by the power tool 1 and translated into the release of the spindle lock. In other words, the detection of the second rotational movement of the tool mount 2 may be used as a signal to release the spindle lock of the power tool 1. The corresponding detection and control process is preferably performed in the device electronics 5 of the power tool 1. However, the power tool 1 may also include a control device (not shown) which may be part of the device electronics 5. In this embodiment of the invention, the detection and control process may preferably also be performed in the control device. The control device may include a processor and / or memory, where, for example, limits for rotation angle and rotation speed may be stored in the memory of the control device. The locations of the motor 4 and device electronics 5 are shown in Figure 1 by way of example only. The described components of the power tool 1 may, of course, be located in various other locations within the power tool 1. [Explanation of symbols]

[0041] 1 Power appliances 2 Tool attachment parts of power tools 3 Power tools 4. Motors of power tools 5 Power equipment devices and electronic equipment 6 User

Claims

1. A method of actuating a spindle lock of a power tool (1), the power tool (1) including a tool mount (2) for receiving a tool (3), a motor (4), and device electronics (5); The method comprises the following steps: a) a user of the power tool (1) holds and rotates the tool attachment portion (2) to perform a first rotational motion in a first rotational direction on the tool attachment portion (2) of the power tool (1); the first rotational movement can be defined by a rotation angle and / or a rotation speed, and limits of the rotation angle and / or the rotation speed are stored in the power tool (1); b) activating the spindle lock by the device electronics (5) of the power tool (1) when at least one of the limit values ​​of the rotation angle and / or the limit value of the rotation speed is exceeded; A method comprising:

2. A method for releasing a spindle lock on a power tool (1), the power tool (1) including a tool mount (2) for receiving a tool (3), a motor (4), and device electronics (5); The method comprises the following steps: a) applying a torque in a second rotational direction to the motor (4) of the power tool (1) while the spindle lock is active; b) application of the torque to the motor (4) in a second rotational direction, thereby causing the tool attachment portion (2) to rotate in the second rotational direction; and c) sensing the rotational movement in the second rotational direction by the device electronics (5); d) releasing the spindle lock by the device electronics (5) of the power tool (1) when rotational movement of the tool mount (2) in the second rotational direction is detected; and A method comprising:

3. As a step preceding the method step, The method comprises the following steps: e) a user of the power tool (1) holds and rotates the tool attachment portion (2) to perform a first rotational motion in a first rotational direction on the tool attachment portion (2) of the power tool (1), the first rotational movement can be defined by a rotation angle and / or a rotation speed, and limits of the rotation angle and / or the rotation speed are stored in the power tool (1); f) activating the spindle lock by the device electronics (5) of the power tool (1) when at least one of the limit values ​​of the rotation angle and / or the limit value of the rotation speed is exceeded; Including, 3. The method of claim 2, wherein the first rotation direction and the second rotation direction are opposite to each other.

4. 2. The method according to claim 1, characterized in that the rotational movement of the tool mount (2) in the first rotational direction is detected by the device electronics (5) as a rotation of the motor (4) of the power tool (1) without active current supply.

5. 2. The method according to claim 1, characterized in that the limit magnitude of the rotation angle is in the range of 1 to 120 degrees, preferably in the range of 1 to 90 degrees, most preferably in the range of 1 to 60 degrees.

6. 2. The method according to claim 1, characterized in that the rotation speed limits are in the range of 0.05 deg / s to 60 deg / s, preferably in the range of 0.2 deg / s to 45 deg / s, most preferably in the range of 0.5 deg / s to 30 deg / s.

7. 4. The method according to claim 3, characterized in that when a user (6) of the power tool (1) no longer holds the tool mount (2), a torque is applied to the motor (4) causing the tool mount (2) to rotate in the second rotation direction.

8. A power tool for carrying out the method according to any one of claims 1 or 4 to 6, the power tool (1) having a tool mount (2) for receiving a tool (3), a motor (4) and device electronics (5), characterised in that the tool mounting part (2) is designed to be rotatable by being held and rotated by the user, and the device electronics (5) are configured to detect a rotation angle and / or a rotation speed of the rotational movement of the tool mounting part (2), and a spindle lock can be activated by the device electronics (5) in case of exceeding at least one limit value of the rotation angle and / or the rotation speed. Power appliances.

9. A power tool (1) for carrying out the method according to any one of claims 2, 3 or 7, said power tool (1) comprising a tool mount (2) for receiving a tool (3), a motor (4) and device electronics (5), The power tool (1), characterized in that a torque can be applied to the motor (4) of the power tool (1), and the device electronics (5) is configured to detect rotational movement of the tool mounting portion (2) and release the spindle lock when rotational movement in a second rotational direction is detected.

10. 10. The power tool (1) according to claim 9, characterized in that the torque is applied to the motor (4) while a spindle lock is in effect.

11. 10. The power tool (1) of claim 9, characterized in that the application of the torque to the motor (4) results in the rotational movement of the tool mount (2).

12. The power tool (1) according to claim 8, characterized in that said power tool (1) is a core drill device.

13. 9. The power tool (1) according to claim 8, characterized in that the power tool (1) does not require an additional switch for activating and / or releasing the spindle lock.

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